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- W2034333538 abstract "Relative to their normal counterparts, tumor cells generally exhibit a greater stress phenotype and express heat shock proteins (Hsp) that represent candidate targets for anticancer therapy. Here we investigated the role of Hsp70 in survival induced by endoplasmic reticulum (ER) stressors in human leukemia U937 cells. Quercetin, a major dietary flavonoid, or specific silencing affected the expression level of Hsp70 and did not allow the upregulation of inositol-requiring kinase 1α (IRE1α), the prototype ER stress sensor regulating the unfolded protein response (UPR), that protects the cells against the stress of misfolded proteins in the ER. The reduction of Hsp70 prevented the upregulation of immunoglobulin heavy-chain binding protein (BiP), but not of CCAAT/enhancer-binding protein-homologous protein (CHOP), and induced apoptosis. Also specific silencing of IRE1α or inhibition of its endoribonuclease activity by 4μ8c hampered the upregulation of BiP, but not of CHOP, and induced apoptosis. These results suggest that drugs affecting the Hsp70-IRE1α axis, like quercetin, or affecting directly IRE1α may represent an effective adjuvant antileukemia therapy." @default.
- W2034333538 created "2016-06-24" @default.
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- W2034333538 date "2015-01-01" @default.
- W2034333538 modified "2023-09-27" @default.
- W2034333538 title "Quercetin Affects Hsp70/IRE1<i>α</i>Mediated Protection from Death Induced by Endoplasmic Reticulum Stress" @default.
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- W2034333538 doi "https://doi.org/10.1155/2015/645157" @default.
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